Just a quick question re BASIX (I did a search and there are thousands of posts about BASIX!!) - is it OK to upgrade things on your BASIX certificate after it has been issued?
For example - if my certificate passed 3 star taps and I later decide to use 4 or 5 star (ie improvements) or if my windows stipulate single glaze and I later decide to use double glaze (same size and fabric but improved u-value) can I change them without notifying council or having a new BASIX certificate reissued?.
Or are you locked into using what your certificate states?